Helo command rejected: You are not in domain bitmask.net (in reply to RCPT TO command))

Due to some ips not making it into the mynetworks parameter, some hosts will not be able to relay mail:

Feb 28 06:46:04 ant postfix/smtp[20265]: 2AB6B1F5D4: to=, orig_to=, relay=leech.bitmask.net[0.0.0.0]:25, delay=0.61, delays=0/0.01/0.55/0.04, dsn=5.7.1, status=bounced (host leech.bitmask.net[0.0.0.0] said: 554 5.7.1 : Helo command rejected: You are not in domain bitmask.net (in reply to RCPT TO command))

(from redmine: created on 2014-03-18, closed on 2014-04-01, relates #4495 (closed))